ZCZC SPCSWOMCD ALL
ACUS11 KWNS 121842
SPC MCD 121842
VAZ000-WVZ000-130045-
MESOSCALE DISCUSSION 0091
NWS STORM PREDICTION CENTER NORMAN OK
1242 PM CST WED FEB 12 2014
AREAS AFFECTED...VA...SE WV
CONCERNING...HEAVY SNOW
VALID 121842Z - 130045Z
SUMMARY...MODERATE TO HEAVY SNOW IS EXPECTED TO DEVELOP THIS
AFTERNOON FROM SERN WV EWD ACROSS MUCH OF VA. SNOWFALL RATES OF 1
INCH PER HOUR WILL BECOME COMMON WITH LOCALLY HIGHER RATES.
DISCUSSION...LATEST WATER VAPOR IMAGERY SHOWS AN UPPER-LEVEL TROUGH
IN THE MS VALLEY WITH A LEAD SHORTWAVE TROUGH EXTENDING FROM THE SRN
APPALACHIAN MTNS SEWD ACROSS SC. WIDESPREAD PRECIPITATION IS LOCATED
JUST AHEAD OF THIS FEATURE IN A BROAD ZONE OF WARM ADVECTION FROM
ERN GA NEWD INTO THE CAROLINAS. MODEL FORECASTS SUGGEST LARGE-SCALE
ASCENT ALONG THIS ZONE WILL MOVE NWD OVER THE NEXT FEW HOURS BECOME
INCREASINGLY ENHANCED ACROSS NRN NC AND VA LATE THIS AFTERNOON. THIS
WILL AID THE DEVELOPMENT OF MODERATE TO HEAVY SNOWFALL ACROSS VA AND
SERN WV LATE THIS AFTERNOON. THE 18Z SOUNDING FROM GREENSBORO NC
SHOULD BE REPRESENTATIVE OF THE AIRMASS IN VA...SHOWING THE PRIMARY
ZONE FOR DENDRITIC GROWTH BETWEEN 700 AND 500 MB. AS MOISTENING
CONTINUES TO OCCUR BELOW 850 MB...AN ISOTHERMAL LAYER SHOULD BE
FAVORABLE FOR HEAVY SNOW WITH RATES OF 1 INCH PER HOUR COMMON.
LOCALLY HIGHER RATES COULD OCCUR WITHIN THE MORE ORGANIZED BANDING.
..BROYLES.. 02/12/2014
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...AKQ...LWX...RNK...RLX...
LAT...LON 36588077 36738135 37038142 37408123 37728090 38058022
38307929 38467861 38487797 38387749 38137721 37727700
37187685 36697696 36587770 36588077
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